The vector \(\mathcal {D}\)  will be referred to as a partial distances profile (PDP). It was shown in [1]} that for any B-DMC \(W\)  and any \(l\times l\)  polarization kernels \(K\)  with partial distances \(\lbrace \mathcal {D}_i\rbrace ^{l-1}_{i=0}\) , the rate of polarization \(E(K)\)  is given by
\(E(K) = \frac{1}{l}\sum ^{l-1}_{i=0}\log _l \mathcal {D}_i.\) 
